I find things like this to be unique to individuals though. There's a similar lifestyle which basically sleep deprvies you into only 3-4 hours of sleep a day. Some swear by it, even US marines. But others say it's super dangerous.
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From all the research on the topic what I've come away with is that the large majority of the population can benefit from fasting. Our body's have built in mechanisms to thrive during the fasted state, and all of our clean up and repair that is supposed to be done while sleeping is enhanced in a fasted state. The problem with trying to fast in our modern age, is that due to the amounts, frequency, and loads of carbs we have consumed it is hard for us to shift into fasting. Since we are not fat adapted and struggle to utilize fat properly as fuel source, the first stages of fasting are a struggle for a lot of people. Some people that try intermittent fasting never actually go through the process of fat adaptation, because they consume so much carbohydrates that they never actually deplete their glycogen stores. It is important to actually become fat adapted to unlock the results of intermittent fasting. It's the same as people trying to adopt a keto lifestyle, and in the beginning they get the "keto flu". Fasting used to be a normal way of life for ancestors. Like @hoodchef said, that is why we have the term "break"fast.
right on !